# F Numbers vs Thread Calculator

The clearest difference is rating: F Numbers at 5.0 against Thread Calculator's 4.3. F Numbers also leads on ads (none vs shown) and monetization model (free vs ad-supported). Thread Calculator's advantage is ratings volume (13 vs 3). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

F Numbers holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 3 and 13 respectively.

F Numbers ships an update every 13 months, Thread Calculator every 18 months. The most recent releases landed on September 15, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | F Numbers | Thread Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/f-numbers/id929309069/reviews)** | [4.3 (13 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews) |
| Number of ratings | 3 | **13** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 13 months** | Every 18 months |
| Monetization | **Free** | Ad-supported |
| Size | 15 MB | 25 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ASMEIX CORPORATION](https://appshunter.io/developer/911716652) | [GSR Gustav Stursberg GmbH](https://appshunter.io/developer/1559560292) |

## What reviewers say

### F Numbers

[App page](https://appshunter.io/ios/app/f-numbers/id929309069)

Quickly find filler metal groupings for welding procedures and performance qualifications. Access classifications with descriptions of intended use, based on ASME and AWS standards.

**Highlights:** Filler metal grouping lookup, Welding procedure qualification, Performance qualification data, Classification descriptions, ASME Section IX data, AWS standards data

**Features:** macOS Compatibility

**In-app purchases:** none


### Thread Calculator

[App page](https://appshunter.io/ios/app/thread-calculator/id1559560290)

This app provides a quick and easy way to calculate thread dimensions for various units, including tap hole sizes and bolt specifications. It helps metalworkers find precise measurements for internal and external threads without consulting tables.

**Highlights:** Thread cutting calculator for multiple units, Cold forming calculator, Thread repair calculator, Tap hole and bolt diameter calculation, Saves time compared to tables

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is F Numbers free?

F Numbers is free to download, with no in-app purchases.

### Is Thread Calculator free?

Thread Calculator is free to download, with no in-app purchases.

### Which has better reviews, F Numbers or Thread Calculator?

F Numbers is rated higher. F Numbers averages 5.0 out of 5 from 3 ratings, while Thread Calculator averages 4.3 from 13 ratings.

### Do F Numbers or Thread Calculator have ads?

Thread Calculator shows ads; F Numbers does not.

### Which is updated more often, F Numbers or Thread Calculator?

F Numbers ships an update every 13 months, and Thread Calculator every 18 months. Most recently, F Numbers was updated on September 15, 2026 and Thread Calculator on September 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*